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RFID tag device with temperature sensitive antenna

  • US 8,228,172 B2
  • Filed: 09/30/2008
  • Issued: 07/24/2012
  • Est. Priority Date: 09/30/2008
  • Status: Active Grant
First Claim
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1. An antenna apparatus comprising:

  • a first antenna tuned to a first resonant frequency to transmit and receive electromagnetic signals, said first antenna associated with a temperature sensitive material that, upon said apparatus being exposed to a particular temperature level over a predefined time interval, causes a shift in said first resonant frequency,wherein upon said apparatus being exposed to said particular temperature level over said predefined time interval, a second antenna is configured to maintain an initial resonant frequency used by the first antenna.

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